Abstract
Some reasons for the recent scientific interest in the Earth's middle atmosphere are dicussed. It is thought that a better understanding of basic processes related to solar and planetary electromagnetic radiation, atmospheric fluid dynamics, and the photochemical behaviour of certain minor constituents, is the key to predicting, and perhaps avoiding, the threat of natural and anthropogenically-induced changes to the atmospheric and surface environment. One of the most powerful experimental techniques available for research into this problem is infrared remote sensing, and an novel example of this was the Stratospheric and Mesospheric Sounder (SAMS) instrument on the satellite Nimbus 7. This article reviews what has been learned so far using SAMS data, and what remains to be done. It also looks forward to its successor, the Improved Stratospheric and Mesospheric Sounder being developed for the forthcoming Upper Atmosphere Research Satellite.
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